Petersburg Nuclear Physics Institute DOUBLE POLARIZED DD-FUSION P. Kravtsov, N. Chernov, K. Grigoryev, I. Ivanov, E. Komarov, L. Kotchenda, M. Mikirtychyants, S. Sherman, V. Trofimov, A. Vasilyev, M. Vznuzdaev Petersburg Nuclear Physics Institute, Gatchina, Russia R. Engels, L. Kroell, F. Rathmann, H. Stroeher IKP, Forschungszentrum Juelich, Germany H. Paetz Gen. Schieck IKP, University of Cologne, Germany M. Marusina, S. Kiselev, P. Monich, I. Harrasov University ITMO, St.Petersburg, Russia 15.11.2018 P. Kravtsov

Participating Institutions Petersburg Nuclear Physics Institute, Russia Forschungszentrum Jülich, Germany Cologne University, Germany KVI, Gronningen, Netherlands University ITMO, St.Petersburg, Russia Ferrara University, Italy (?) Financial support: ISTC project #3881 Deutsche Forschungsgemeinschaft Russian Academy of Science 15.11.2018 P. Kravtsov

Double polarized dd-fusion The main 4-nucleon fusion reaction – good testing ground for microscopic calculations t + p d + d 3He + n Systematic measurements of the spin-correlation coefficients Cross section increase [R.M. Kulsrud et al., Phys. Rev. Lett. 49, 1248 (1982)] 3He+d → 4He+p : Factor ~1.5 at 430 keV [Ch. Leemann et al., Annals of Phys. 66, 810 (1971)] Neutrons suppression Quintet suppression factor [H. Paetz gen. Schieck, Eur. Phys. J. A 44, 321–354 (2010)] [Deltuva and Fonseca, Phys. Rev. C 81 (2010)] Trajectories control of the fusion products United efforts on the practical use of the polarized fusion Persistence of the Polarization in a Fusion Process [J.-P. Didelez and C. Deutsch. Few-Body Conference, Bonn (2009)] 15.11.2018 P. Kravtsov

History B.P. Ad’jasevich, V.G. Antonenko Measurement of the polarization correlation coefficients in reactions 2H(d, p)3H and 2H(d, n)3He at low energies. 1976 15.11.2018 P. Kravtsov

Unpolarized cross sections R. E. Brown, N. Jarmie, Phys. Rev. C 41 N4 (1990) 15.11.2018 P. Kravtsov

Data situation Tagishi et al.; Phy. Rev. C 46 (1992) 1155-1158 [Analysing Powers: 2H(d,p)3H, solid target] Becker et al. Few Body Sys. 13 (1992) [Analysing Powers] Imig et al. Phys.Rev. C 73 (2006) [Spin-Transfer Koeff.] All experiments were performed at solid targets 15.11.2018 P. Kravtsov

The Quintet suppression factor Deltuva and Fonseca, Phys. Rev. C 81 (2010) Direct experiment is needed! 15.11.2018 P. Kravtsov

? Electron screening Astrophysical S-Factor: F. Raiola et al.; Eur. Phys. J. A 13, 377 (2002) ? Coulomb Potential Distance Nuclear Potential 15.11.2018 P. Kravtsov

Adjacent experiments Persistence of the Polarization in a Fusion Process. J.-P. Didelez and C. Deutsch. Few-Body Conference, Bonn (2009). Basic study on polarized D-D fusion. N. Horikawa. International Symposium on Polarized Target and its Application (2008). 15.11.2018 P. Kravtsov

Experimental setup Luminosity: 1.3∙1025 1/cm2 s → count rate: ~ 54/h (30keV) → 1 week of beam time 15.11.2018 P. Kravtsov

Hyperfine states 15.11.2018 P. Kravtsov

Count rate Typical charged-particle spectra [Becker et al. Few Body Sys. 13 (1992)] 0.82 MeV 1.01 MeV 3.02 MeV 15.11.2018 P. Kravtsov

SAPIS ABS 15.11.2018 P. Kravtsov

SAPIS ABS Vacuum system Dissociator design Transition units design Magnet system design 15.11.2018 P. Kravtsov

ABS: Magnet system Magnet N1 15.11.2018 P. Kravtsov

POLIS Ion source 15.11.2018 P. Kravtsov

POLIS. Control system. compact (high channel density) widely used in our systems at BNL, PSI, GSI and AIRBUS test rig VERY old (is not supported 10 years) failed to work in KVI before departure 15.11.2018 P. Kravtsov

Experimental hall 15.11.2018 P. Kravtsov

Experimental hall. Equipment layout 15.11.2018 P. Kravtsov

Electronics platform 15.11.2018 P. Kravtsov

Detector system Proof of principle: L. Kroell. Diploma thesis, 2010. 4- detector setup with 60% filling ~300 Hamamatsu Si PIN photodiodes (S3590) 1cm2 active area 300um depletion layer good energy resolution (17keV for 1MeV Carbon ions at RHIC) Proof of principle: L. Kroell. Diploma thesis, 2010. FZJ – RWTH. Readout electronics requirements: 320 PIN diodes ≤ 1kHz total count rate Amplitude analyzer Common clock for off-line coincidence analysis Custom CSP (Charge Sensitive Preamplifiers) 15.11.2018 P. Kravtsov

PIN-diode measurements Alpha-source: Pu239 + Pu240 = 80.4% Pu238 + Am241 = 19.6% Dead layer measurements: P. Monich. Bachelor thesis, 2011. ITMO University. D=0.72(1.66)μm 15.11.2018 P. Kravtsov

PIN diode measurements XY surface scan of the PIN diode 15.11.2018 P. Kravtsov

Initial detector system 4- rotational gimbal support step motors with good angular resolution (~0.01 degree) Initial detector system: I. Harassov. Diploma thesis, 2011. ITMO University. 15.11.2018 P. Kravtsov

Interaction chamber 15.11.2018 P. Kravtsov

Working Plan Infrastructure January 2012 Experimental hall preparation March 2011 Platform for electronics May 2011 Water cooling system December 2011 Assemble and run the POLIS source January 2012 Mechanical assembling June 2011 Vacuum + water distribution system December 2011 Control system December 2011 Adjustments and tuning January 2012 Solid target experiment Spring 2012 Upgrade of the SAPIS ABS Fall 2012 Vacuum system Spring 2012 Magnet system design February 2012 Dissociator design March 2012 Transition units design May 2012 ABS tests and tuning Fall 2012 Detector system Fall 2012 Interaction chamber April 2011 Mechanical support design Spring 2012 Readout electronics design Spring 2012 Electronics production Fall 2012 15.11.2018 P. Kravtsov